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vqf.c
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1 /*
2  * VQF demuxer
3  * Copyright (c) 2009 Vitor Sessak
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "avformat.h"
23 #include "internal.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/dict.h"
26 #include "libavutil/mathematics.h"
27 #include "riff.h"
28 
29 typedef struct VqfContext {
33 } VqfContext;
34 
35 static int vqf_probe(AVProbeData *probe_packet)
36 {
37  if (AV_RL32(probe_packet->buf) != MKTAG('T','W','I','N'))
38  return 0;
39 
40  if (!memcmp(probe_packet->buf + 4, "97012000", 8))
41  return AVPROBE_SCORE_MAX;
42 
43  if (!memcmp(probe_packet->buf + 4, "00052200", 8))
44  return AVPROBE_SCORE_MAX;
45 
46  if (AV_RL32(probe_packet->buf + 12) > (1<<27))
47  return AVPROBE_SCORE_EXTENSION/2;
48 
50 }
51 
52 static void add_metadata(AVFormatContext *s, uint32_t tag,
53  unsigned int tag_len, unsigned int remaining)
54 {
55  int len = FFMIN(tag_len, remaining);
56  char *buf, key[5] = {0};
57 
58  if (len == UINT_MAX)
59  return;
60 
61  buf = av_malloc(len+1);
62  if (!buf)
63  return;
64  avio_read(s->pb, buf, len);
65  buf[len] = 0;
66  AV_WL32(key, tag);
68 }
69 
71  { "(c) ", "copyright" },
72  { "ARNG", "arranger" },
73  { "AUTH", "author" },
74  { "BAND", "band" },
75  { "CDCT", "conductor" },
76  { "COMT", "comment" },
77  { "FILE", "filename" },
78  { "GENR", "genre" },
79  { "LABL", "publisher" },
80  { "MUSC", "composer" },
81  { "NAME", "title" },
82  { "NOTE", "note" },
83  { "PROD", "producer" },
84  { "PRSN", "personnel" },
85  { "REMX", "remixer" },
86  { "SING", "singer" },
87  { "TRCK", "track" },
88  { "WORD", "words" },
89  { 0 },
90 };
91 
93 {
94  VqfContext *c = s->priv_data;
95  AVStream *st = avformat_new_stream(s, NULL);
96  int chunk_tag;
97  int rate_flag = -1;
98  int header_size;
99  int read_bitrate = 0;
100  int size;
101  uint8_t comm_chunk[12];
102 
103  if (!st)
104  return AVERROR(ENOMEM);
105 
106  avio_skip(s->pb, 12);
107 
108  header_size = avio_rb32(s->pb);
109 
112  st->start_time = 0;
113 
114  do {
115  int len;
116  chunk_tag = avio_rl32(s->pb);
117 
118  if (chunk_tag == MKTAG('D','A','T','A'))
119  break;
120 
121  len = avio_rb32(s->pb);
122 
123  if ((unsigned) len > INT_MAX/2) {
124  av_log(s, AV_LOG_ERROR, "Malformed header\n");
125  return -1;
126  }
127 
128  header_size -= 8;
129 
130  switch(chunk_tag){
131  case MKTAG('C','O','M','M'):
132  avio_read(s->pb, comm_chunk, 12);
133  st->codec->channels = AV_RB32(comm_chunk ) + 1;
134  read_bitrate = AV_RB32(comm_chunk + 4);
135  rate_flag = AV_RB32(comm_chunk + 8);
136  avio_skip(s->pb, len-12);
137 
138  if (st->codec->channels <= 0) {
139  av_log(s, AV_LOG_ERROR, "Invalid number of channels\n");
140  return AVERROR_INVALIDDATA;
141  }
142 
143  st->codec->bit_rate = read_bitrate*1000;
144  break;
145  case MKTAG('D','S','I','Z'): // size of compressed data
146  {
147  av_dict_set_int(&s->metadata, "size", avio_rb32(s->pb), 0);
148  }
149  break;
150  case MKTAG('Y','E','A','R'): // recording date
151  case MKTAG('E','N','C','D'): // compression date
152  case MKTAG('E','X','T','R'): // reserved
153  case MKTAG('_','Y','M','H'): // reserved
154  case MKTAG('_','N','T','T'): // reserved
155  case MKTAG('_','I','D','3'): // reserved for ID3 tags
156  avio_skip(s->pb, FFMIN(len, header_size));
157  break;
158  default:
159  add_metadata(s, chunk_tag, len, header_size);
160  break;
161  }
162 
163  header_size -= len;
164 
165  } while (header_size >= 0 && !avio_feof(s->pb));
166 
167  switch (rate_flag) {
168  case -1:
169  av_log(s, AV_LOG_ERROR, "COMM tag not found!\n");
170  return -1;
171  case 44:
172  st->codec->sample_rate = 44100;
173  break;
174  case 22:
175  st->codec->sample_rate = 22050;
176  break;
177  case 11:
178  st->codec->sample_rate = 11025;
179  break;
180  default:
181  if (rate_flag < 8 || rate_flag > 44) {
182  av_log(s, AV_LOG_ERROR, "Invalid rate flag %d\n", rate_flag);
183  return AVERROR_INVALIDDATA;
184  }
185  st->codec->sample_rate = rate_flag*1000;
186  break;
187  }
188 
189  if (read_bitrate / st->codec->channels < 8 ||
190  read_bitrate / st->codec->channels > 48) {
191  av_log(s, AV_LOG_ERROR, "Invalid bitrate per channel %d\n",
192  read_bitrate / st->codec->channels);
193  return AVERROR_INVALIDDATA;
194  }
195 
196  switch (((st->codec->sample_rate/1000) << 8) +
197  read_bitrate/st->codec->channels) {
198  case (11<<8) + 8 :
199  case (8 <<8) + 8 :
200  case (11<<8) + 10:
201  case (22<<8) + 32:
202  size = 512;
203  break;
204  case (16<<8) + 16:
205  case (22<<8) + 20:
206  case (22<<8) + 24:
207  size = 1024;
208  break;
209  case (44<<8) + 40:
210  case (44<<8) + 48:
211  size = 2048;
212  break;
213  default:
214  av_log(s, AV_LOG_ERROR, "Mode not suported: %d Hz, %d kb/s.\n",
215  st->codec->sample_rate, st->codec->bit_rate);
216  return -1;
217  }
218  c->frame_bit_len = st->codec->bit_rate*size/st->codec->sample_rate;
219  avpriv_set_pts_info(st, 64, size, st->codec->sample_rate);
220 
221  /* put first 12 bytes of COMM chunk in extradata */
222  if (ff_alloc_extradata(st->codec, 12))
223  return AVERROR(ENOMEM);
224  memcpy(st->codec->extradata, comm_chunk, 12);
225 
226  ff_metadata_conv_ctx(s, NULL, vqf_metadata_conv);
227 
228  return 0;
229 }
230 
232 {
233  VqfContext *c = s->priv_data;
234  int ret;
235  int size = (c->frame_bit_len - c->remaining_bits + 7)>>3;
236 
237  if (av_new_packet(pkt, size+2) < 0)
238  return AVERROR(EIO);
239 
240  pkt->pos = avio_tell(s->pb);
241  pkt->stream_index = 0;
242  pkt->duration = 1;
243 
244  pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip
245  pkt->data[1] = c->last_frame_bits;
246  ret = avio_read(s->pb, pkt->data+2, size);
247 
248  if (ret != size) {
249  av_free_packet(pkt);
250  return AVERROR(EIO);
251  }
252 
253  c->last_frame_bits = pkt->data[size+1];
254  c->remaining_bits = (size << 3) - c->frame_bit_len + c->remaining_bits;
255 
256  return size+2;
257 }
258 
260  int stream_index, int64_t timestamp, int flags)
261 {
262  VqfContext *c = s->priv_data;
263  AVStream *st;
264  int ret;
265  int64_t pos;
266 
267  st = s->streams[stream_index];
268  pos = av_rescale_rnd(timestamp * st->codec->bit_rate,
269  st->time_base.num,
270  st->time_base.den * (int64_t)c->frame_bit_len,
271  (flags & AVSEEK_FLAG_BACKWARD) ?
273  pos *= c->frame_bit_len;
274 
275  st->cur_dts = av_rescale(pos, st->time_base.den,
276  st->codec->bit_rate * (int64_t)st->time_base.num);
277 
278  if ((ret = avio_seek(s->pb, ((pos-7) >> 3) + s->data_offset, SEEK_SET)) < 0)
279  return ret;
280 
281  c->remaining_bits = -7 - ((pos-7)&7);
282  return 0;
283 }
284 
286  .name = "vqf",
287  .long_name = NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"),
288  .priv_data_size = sizeof(VqfContext),
293  .extensions = "vqf,vql,vqe",
294 };